It may be harmless, and I have no problem with anyone playing with a $3 toy, but some clinics are charging vast sums for treatment. Of course they say you need a specific frequency of light, yada, yada, in order to justify their fees, so you know some people are getting swindled out there. As well, some people may put off definitive medical treatment in order to try this method. Almost any treatment will work if you believe in it and the outcomes are subjective. This is the placebo effect. Because of this, I distrust self-experimentation unless the outcome is measurable. I'll wait for real studies on the subject.
Whatever you feel comfortable with.